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QUESTION: 1

The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there?

Solution:

There are three modes of heat transfer i.e. radiation, convection and conduction.

QUESTION: 2

Consider system A at uniform temperature t and system B at another uniform temperature T (t > T). Let the two systems be brought into contact and be thermally insulated from their surroundings but not from each other. Energy will flow from system A to system B because of

Solution:

Greater the temperature imbalance the higher would be the rate of energy transfer.

QUESTION: 3

An oil cooler in a high performance engine has an outside surface area 0.12 m^{2} and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m 2 K. Find out the heat transfer rate?

Solution:

: Q = (T_{2} – T_{1}) A h = 0.12 (65-30) 45.4 = 190.68 W.

QUESTION: 4

Unit of rate of heat transfer is

Solution:

Unit of heat transfer is Joule but rate of heat transfer is joule per second i.e. watt.

QUESTION: 5

Convective heat transfer coefficient doesn’t depend on

Solution:

It is denoted by h and is dependent on space, time, geometry, orientation of solid surface.

QUESTION: 6

The rate equation used to describe the mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on

Solution:

It is directly proportional to all of above except time.

QUESTION: 7

How many types of convection process are there?

Solution:

Forced, natural and mixed convection.

QUESTION: 8

Thermal conductivity is maximum for which substance

Solution:

Thermal conductivity of diamond is 2300 W/m K.

QUESTION: 9

A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body

Solution:

As, q = Q/A

= 5.67 * 10^{-8} (273+60)^{4} = 697.2.

QUESTION: 10

Which of the following is an example of forced convection?

Solution:

In forced convection the flow of fluid is caused by a pump, fan or by atmospheric winds.

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